<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .header {
            width: 400px;
            height: 200px;
        }
        .header .left{
            width: 200px;
            height: 200px;
            background-color: hotpink;
            float: left;
        }
        .header .right{
            width: 200px;
            height: 200px;
            background-color: green;
            float: left;
        }
        .header .right .top{
            width: 200px;
            height: 100px;
            background-color: greenyellow;
        }
        .header .right .bottom{
            width: 200px;
            height: 100px;
            background-color: gold;
        }
    </style>
</head>
<body>
    <div class="header">
        <div class="left">

        </div>
        <div class="right">
            <div class="top">

            </div>
            <div class="bottom">

            </div>
        </div>
    </div>
</body>
</html>